How do the cells of the onion compare with those of the cells you have seen before?

Onion cells are typically rectangular and have a clear, defined cell wall, which provides structure and rigidity. Unlike animal cells, they contain a large central vacuole that helps maintain turgor pressure, and their cytoplasm appears less dense due to the presence of this vacuole. Additionally, onion cells often show a distinct nucleus and are organized in layers, which can be contrasted with more irregularly shaped cells seen in other organisms. Overall, onion cells exemplify the characteristics of plant cells, showcasing differences from the more varied shapes and structures of animal cells.